home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!olivea!decwrl!deccrl!news.crl.dec.com!dbased.nuo.dec.com!nntpd.lkg.dec.com!ryn.mro4.dec.com!empror.enet.dec.com!pierson
- From: pierson@empror.enet.dec.com (dave pierson)
- Newsgroups: rec.railroad
- Subject: Continuously Welded Rail
- Message-ID: <1993Jan22.173201.27845@ryn.mro4.dec.com>
- Date: 22 Jan 93 20:15:21 GMT
- Sender: news@ryn.mro4.dec.com (USENET News System)
- Organization: Digital Equipment Corporation
- Lines: 35
-
-
- Retrofit of an Elevated Structure with Low Restraint Rail
- Proceedings, Joint IEEE/ASME Railroad Conference, 1991
- A E Fazio Division Engineer, AMTRAK, Penn Station NYC
- F Russo Previous chief engineer, structures, SEPTA
- S A Matina Parsons, Brincjerhoff, Quade & Douglas
-
- The standard installation of railway track comprised of continuously
- welded railway rail involves fixing the rail to the ties or other
- support structure with the purpose of completely eliminating thermal
- deformation in the rail. This type of installation gives rise to high
- thermal stress in the rail. An alternative, and much less common,
- installation involvesutilizes rail expansion joints to to permit the
- rail to deform with change in temperature.
-
- ....
-
- Typical anchorage temperatures for CWR are in excess of 80F, and in some
- cases ... exceed 100F. Although this is considerably higher than the
- mean annual temperatures [...in North America...], haigher temperatures
- are favored since track buckling ( ... due to compressive stress) is
- viewed as more catastrophic than rail pull-aparts (due to tensile
- stress.).
-
- (etc... to talk about the limits in the Philly rebuild of the ex RDG
- elevated line, since the structure wouldnt handle the stress due to
- temperature, they _had_ to use expansion joints.)
-
- thanks
- dave pierson |the facts, as accurately as i can manage,
- Digital Equipment Corporation |the opinions, my own.
- 40 Old Bolton Rd |I am the NRA.
- Stow, Mass, USA
- 01775 pierson@msd26.enet.dec.com
- "He has read everything, and, to his credit, written nothing." A J Raffles
-